    /// <summary>
    /// https://open.dingtalk.com/document/orgapp/custom-bot-send-message-type
    /// </summary>
    public class DingTalkMsg
    {
        public At at { get; set; }
        public Link link { get; set; }
        public Markdown markdown { get; set; }
        public Feedcard feedCard { get; set; }
        public Text text { get; set; }

        public string msgtype { get; set; }

        public Actioncard actionCard { get; set; }
    }

    public class Msgtype
    {
        public static readonly string link="link";
        public static readonly string markdown="markdown";
        public static readonly string feedCard="feedCard";
        public static readonly string text="text";
        public static readonly string actionCard="actionCard";
    }

    public class At
    {
        public string isAtAll { get; set; }
        public string[] atUserIds { get; set; }
        public string[] atMobiles { get; set; }
    }

    public class Link
    {
        public string messageUrl { get; set; }
        public string picUrl { get; set; }
        public string text { get; set; }
        public string title { get; set; }
    }

    public class Markdown
    {
        public string text { get; set; }
        public string title { get; set; }
    }

    public class Feedcard
    {
        public Links links { get; set; }
    }

    public class Links
    {
        public string picURL { get; set; }
        public string messageURL { get; set; }
        public string title { get; set; }
    }

    public class Text
    {
        public string content { get; set; }
    }

    public class Actioncard
    {
        public string hideAvatar { get; set; }
        public string btnOrientation { get; set; }
        public string singleTitle { get; set; }
        public Btn[] btns { get; set; }
        public string text { get; set; }
        public string singleURL { get; set; }
        public string title { get; set; }
    }

    public class Btn
    {
        public string actionURL { get; set; }
        public string title { get; set; }
    }